Transformer insulation ring



A ril 15, 1924. 1,490,299

A. W. THOMPSON TRANSFORMER INSULATION RING -Filed Feb. 15, 1919 WITNESSES: 6 mvzgm'on v Q Arf/zur W Thom 0am. h f BY 0 9 A 7 ATTORNEY the structure shown in Fig. 2.

has been customary to Patented Apr. 15, 1924.

UNITED STATES PATENT OFFICE.

ARTHUR W. THOMPSON, OF EAST MCKEESPORT, PENNSYLVANIA. A SSIGNOR TO WEST- INGHOUSE ELECTRIC & MANUFACTURING COMPANY. A CORPORATION OF PEN N- SYLVANIA.

TRANSFORMER INSULATION RING.

Application filed February 15, 1919. Serial No. 277,183.

To all whom it may concern:

Be it known that I. ARTHUR W. THOMP- SON, a citizen of the United States, and a resident of East McKeesport, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Transformer Insulation Rings, of which the following is a specification.

My invention relates to transformers, and it has special relation to insulating means, for apparatus of the character described, which are disposed between the coils of such an apparatus and the core member thereof. 1

In the accompanying drawing, Fig. 1 is a fragmentary view, in elevation, of a portion of a transformer showing .a section of the core member and the coils related thereto, together with my improved insulating means in position thereupon; Fig. 2 is an enlarged elevational view of a single insulating means, and'Fig. 3 is a plan view of In high-voltage, core-type transformers, difliculty has heretofore been experienced in properly insulating the high-tension coils from the yoke portions of the core members on account of the limitations of space and the'heating considerations. The difficulties experienced in this connection and the structure by means of which such difficulties are overcome will be more fully set forth in the ensuing description.

Referring more, particularly to the drawing, a fragmentary portion 1 of a core of a transformer is shown as having coils 2-2 inductively related thereto. In order to provide a sufficient insulating barrier between the coils which surround the longitudinal portion of the core and the yoke portion thereof, insulating rings 3-3 arev disposed as shown, these being of such form that they surround the core in the same manner as the coils, and, at the same time,

have such dimensions that the flat surfacespaces be provided in the insulating means fluid, may flow, it rill holes or otherwise provide radial openings in these rough which a cooling wooden insulating means. This provision of holes or openings resulted in a general weakening of the structure.

I propose, therefore, to dispose, between the top coil and the yoke portion of the transformer core, as Well as between the bottom coil and the bottom yoke portion, insulating rings which are composed of fibrous material such, for example. as fullerboard and which are so constructed that adequate openings are left therein through which the cooling medium may flow outwardly after passing between the coils and the core.

Referring now to Figs. 2 and 3, the detailed construction of these insulating rings 3, is shown. Annular members 4 of suitable insulating material have flat pieces 55 disposed between them in such manner that a staggered, checker-work structure is formed. in which openings 6-6 are left between 'the flat pieces. It will be observed, by reference to the figures. that the openings are likewise in staggered relation. The annular members 4 and the flat pieces 5 are fastened together by any suitable fas-' tening means 77.-

I find it beneficial, in the prevention of short circuits between the coils and the core, and through the insulating members, to pass the fastening means through the rings in such manner that no one fastening means extends entirely through the insulating structure. Reference to Fig. 2 will show that the fastening means are passed through two of the annular members and the flat pieces associated with those two members only. Again, the next layer of flat pieces is secured together, b assin the fastenaccordance with the above description comprises an integral structure of extreme strength and durability, having the requisite openings to permit cooling fluid to pass radially therethrough and being fastened together by strong durable fastening means, which are so positioned that no occasion for short-circuit is afforded by reason of the fastening means extending entirely through the insulating structure.

While I have described, and furthermore find beneficial, the use of fibrous material in the construction of this insulating ring,

I do not wish to be limited to this material, since it is apparent that those skilled in the art may substitute other materials therefor. For example, in certain cases, it may be desirable to employ material known as micarta, which embodies a phenolic condensation product. Again, it is apparent that modifications may be made in the checkerwork structure of the insulating ring and the manner of disposing the flat pieces therein, and I Wish therefore that the appended claims be construed broadly to cover the novel features of my invention.

I claim as my invention:

1. An insulating ring for transformers comprising two annular members of insulat- -ing material and a plurality of spacing arranged between said annular members in staggered relation to each other, whereby a perforated structure is formed which allows the (:OOliIIg medium flowing between the core and coils to pass therethrough.

4. In a transformer, an insulating ring structure comprising annular insulating members, and insulating and spacing members separating the annular members and disposed therebetween in such manner that openings are provided through which a cooling medium may flow radially.

5. In a transformer, an insulating ring structure comprising annular members, one set of separating members between two of the annular members and another set of separating members betwwn another two of the annular members and shifted circumferentially with respect to the first set, whereby a staggered structure, through which a coolin medium may pass, is provided.

6. Iii a transformer, an insulating ring structure comprising annular members, one set of separating members between two of the annular members, another set of separating members between another two of the annular members and shifted circumferentially with respect to the first set, whereby a staggered structure, through which a cooling medium may pass, is provided, and connecting means for binding the annular members together.

7. In a transformer, an insulating ring structure comprising annular members, one set of separating members between two of the annular members, another set of separating members between another two of the annular members and shifted circumferentially with respect to the first set, whereby 'a staggered structure, through which a cooling medium may pass, is provided, and connecting means extending through the separating members for binding the annular members together.

8. In a transformer, an insulating ring structure comprising annular members, one

. set of separating members between two of the annular members, another set of separating members between another of the two annular members and shifted circumferentially with respect to the first set, whereby a staggered structure, through which a cooling medium may pass, is provided, and connecting means for binding the annular members together, alternate connecting means extending through the separating means in the same set.

9. In a transformer, an insulating ring structure, comprising annular members, one set of separating members between two of the annular members, another set of separating members between another two of the annular members and shifted circumferentially with respect to the first set, whereb a staggered structure, through which a 000 ing medium may pass, is provided, and connecting means for binding the annular member together, alternating connecting means extending throu h the separating means in the same set an only the annular members associated with said set, whereby no one connecting' means extends entirely through the ring structure.

In testimony whereof, I have hereunto subscribed my name this 31st day of Jan.,

ARTHUR W. THOMPSON. 

